<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. select bond fund, 09/30/00 financial statement class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 021
<NAME> SELECT BOND FUND CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 39,306,235
<INVESTMENTS-AT-VALUE> 37,132,817
<RECEIVABLES> 1,618,637
<ASSETS-OTHER> 6,172
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 38,757,626
<PAYABLE-FOR-SECURITIES> 1,098,948
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 344,359
<TOTAL-LIABILITIES> 1,443,307
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 39,903,518
<SHARES-COMMON-STOCK> 3,783,220
<SHARES-COMMON-PRIOR> 3,549,364
<ACCUMULATED-NII-CURRENT> 3,920
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (414,339)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2,178,780)
<NET-ASSETS> 37,314,319
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,369,891
<OTHER-INCOME> 0
<EXPENSES-NET> (158,545)
<NET-INVESTMENT-INCOME> 1,211,346
<REALIZED-GAINS-CURRENT> 185,785
<APPREC-INCREASE-CURRENT> 287,442
<NET-CHANGE-FROM-OPS> 1,684,573
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,140,877)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 147,667
<NUMBER-OF-SHARES-REDEEMED> 36,671
<SHARES-REINVESTED> 122,860
<NET-CHANGE-IN-ASSETS> 2,648,345
<ACCUMULATED-NII-PRIOR> 3,918
<ACCUMULATED-GAINS-PRIOR> (600,795)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 54,421
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 234,755
<AVERAGE-NET-ASSETS> 33,705,512
<PER-SHARE-NAV-BEGIN> 9.13
<PER-SHARE-NII> 0.30
<PER-SHARE-GAIN-APPREC> (0.19)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.24
<EXPENSE-RATIO> .85
</TABLE>
